Are you running TDM mode? This might cause problems.
Are you using team spawns without TDM? Duh.
Are you using team spawns with no teams? Also duh.
Are they even your bricks? If so, make sure this is checked:
'Use Spawn Points [V]'
(DUH)
If not, make sure BOTH of these are checked:
'Use All Players Bricks [V]'
'Use Spawn Points [V]'
And make sure this is NOT checked:
'Players Use Own Bricks []'
Do you have any private mods? Turn em' off. They might be interfering with BL.
Do you have any checkpoints set up? (CP events) Well turn THOSE off.
Do you have any auto-checkpoint mods? You should REALLY disable those.
Is your blockland just plain messed up? Yep, that will do it.
If none of these are your problem, then idunno what's going on.